core_pattern:
core_pattern is used to specify a core dumpfile pattern name.
. max length 128 characters; default value is "core"
. core_pattern is used as a pattern template for the output filename;
certain string patterns (beginning with '%') are substituted with
their actual values.
. backward compatibility with core_uses_pid:
If core_pattern does not include "%p" (default does not)
and core_uses_pid is set, then .PID will be appended to
the filename.
. corename format specifiers:
%<NUL> '%' is dropped
%% output one '%'
%p pid
%u uid
%g gid
%s signal number
%t UNIX time of dump
%h hostname
%e executable filename (may be shortened)
%E executable path
%<OTHER> both are dropped
. If the first character of the pattern is a '|', the kernel will treat
the rest of the pattern as a command to run. The core dump will be
written to the standard input of that program instead of to a file.

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